Drill.



I PATENTED AUG; 2a, 1906.

H. R. DECKER.

DRILL.

- APPLICATION IILED NOV.13. 1905.

2 SHEETS-SHEET 1.

NR-muses N0-829,634. PATBNTED AUG.28,1906. R.

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UNITED STATES PATENT OFFICE.

HARRY R. DECKER, ()F HOUSTON, TEXAS.

. DRILL.

Specification of Letters Patent.

Patented Aug. 28, 1906.

Application filed November 13, 1905. Serial No. 287.150.

To (1.7] whom it may concern:

Be it known that I, HARRY It. DECKER, a citizen of the United States, residing at Houston, in the county of Harris and State of Texas, have invented certain new and useful Improvements in Drills, of which the follow ing is a specification.

My invention relates to drills used in drillingArtesian and oil wells, and has especial ref erence to drill-heads having removable bits. In drill-heads of this description a great disadvantage arises from the loosening of the bits in the head while in use, thus impairing the successful working of the device. In my improvement the drill-bits where secured in the drill-head are provided with slanting edges, and a cone-shaped plug is inserted in the drill-head, Which, bearing against the slanting edges of the bits, takes up and counteracts the effect of the loosening of the bits.

, The description of my inventionwill be found hereinafter and illustrated in the accompanying drawings, in which- Figure 1 is a vertical sectional view of a drill-head and a fragment of a tubular drillrod, showing my invention; Fig. 2, a crosssection of the drill-head on the line a: a: of Fig. 1, and Fig. 3 an edge view of the drill-bit.

In the drawings similar reference characters indicate corresponding parts throughout the several views.

A represents the drill-head, having a bore B therethrough and any desired number of radial slots C therein, having their upper ends D wider than their lower ends E, as shown, to receive the shanks F of drill-bits G, which have their ends H wider than the ortion I adjacent to the blade. In placing t e bits in position the shank F is inserted into bore B and then slid into one of the slots C. The inner edge J of the shank is inclined, as shown in Fig. 1.

K represents a plug insertedin bore B downwardly and has its lower end L made conicalshaped to fit the inclined edges J of the shanks F, while its upper end has a lateral flange M for the purpose hereinafter explained, the diameter of the plug at its upper end being slightly shorter than the diameter of the top face of the drill-head A.

N represents a bore through plug K for the passage of water to the drill-bits to purge the well-bore of the borings.

0 represents screw-heads on are upper portion of drill-head A, on which is mounted an interiorly-threaded coupling-ring I, while Q represents the tubular drill-rod having its end threaded to fit the threads in couplingring P.

In using drills the rod is given a partial turn after each cutting stroke. As the drillheadby contacting with the sides of the drillbore resists this turning rroveirent the tend ency is for the drill-rod Q to be driven into the coupling-ring P and the drill-head A to creep up into the coupling-ring. It will be understood that this tendency of the drillrod and drill-head serves to keepthe lower end L of plug K in close engagement with the inclined edges J of drill-bit shanks F, and it is this tendency that serves to keep the drillbits G tight on the drill-head A.

Having thus described my invention, what I claim is 1. In a drill, a drill-head having a bore therethrough and its outer surface threaded, a drill-rod having its lower and threaded end secured to the head by a threaded coupling, drill-bits mounted in said head, a plu mounted in the bore in the drill-head and Iiaped to engage the drill-bits and hold them in the drill-head, the top of said plug being engaged by the lower end of the drill-rod to depress it, substantially as shown and described.

2. In a drill, a drill-head having a smooth bore therethrough, radial slots in the lower end of said drill-head opening into said bore and having their upper ends wider than their lower ends, drill-bits having shanks to fit said slots and having their inner edges slanting and extending into the bore in the head, a plug loosely mounted in said bore and having its lower end tapered to fit the slanting edges of the bit-shanks, and means to depress said plug to tighten the bit-shanks in said slots, substantially as shown and described.

3. In a drill, a drill-head having a smooth bore therethrough, radial slots in the lower end of said drill-head opening into said bore and having their upper ends wider than their lower ends, drill-bits having shanks to fit said slots and having their inner edges slanting, and extending into the bore in the head, a plug loosely mounted in said bore and having its lower end tapered to fit the slanting edges of the bit-shanks, the outer surface of the drill-head formed with screw-threads, a coupling-ring secured on said threads, and the drill-rod secured in said coupling-ring and engaging the upper end of said plug, substantially as shown and described.

4. In a drill, a drill-head having a bore therethrough, radial slots extendin said bore into the drill-head, drill-bits aving shanks to fit said slots and having their inner edges slanting, a plug to fit said bore and formed with a tapered lower end to fit the slanting edges of the bit-shanks the upper end of said plug formed with a lateral flange, the outer surface of the drill-head screwthreaded, a coupling-ring secured on said threads, and a tubular drill-rod secured in said coupling-ring and engaging the flange on said plug, substantially as shown and described.

5. In a drill, a drill-head having a smooth bore therethrough, radial slots in the lower end of said drill-head opening into said bore and having their upper ends wider than their lower ends, drill-bits having shanks to fit said from slots and having their inner edges slanting,

and extending into the -bore in the head, a 20 plug loosely mounted in said bore and having its lower end tapered to fit the slanting edges of the bit-shanks, the upper end of said plug formed with a lateral flange, the outer surface drill-rod secured in said coupling-ring and engaging the flange on said plug, substantially as shown and described.

In testimony whereof I hereto affix my sigo nature in the presence of two witnesses.

HARRY R. DECKER.

Witnesses J. R. MoRsE, WM. CLARK. 

